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Unit won't work on AUTO-HEAT thetmostat setting

I do apt. maintenance and have a G.E. air handler(very old) that wont work on the auto-heat setting. Strip heat,no sequencer,old style of relay that has contactor in it. Heat will work with thermostat in the on position but not auto. Changed thermostat and relay still same thing . Oh yea, the a.c. works fine on auto. No burnt or broken wires that I can see.

Those old ge units need a thermostat that energizes the G terminal on the call for heat. Honeywell had a cheapo stat that had a "1" and a "2" terminal on the sub base. If you jumpered these terminals together, the g terminal will energize on the call for heat. You cannot simply jumper G and W because when the manual fan is on the heat will also be on. If you could find a simple non-programmable electronic stat that had an installer setup option of "fan on with call for heat" or somthing along that line that would fix you up.

ive got 66 units that have this same setup and ive always used white rogers thermos installing the jumper tween rh- rc fan to g compressor to y heat to w with no prolems?

Swap with a stat that you know is working. See if your problem follows the stat or stays with the furnace. Beyond that you need to call a service tech. You need to find out if your signals are getting to where they are supposed too. Should be easy because you've got 65 working examples.